DK149558B - FOOD PREHEATER - Google Patents
FOOD PREHEATER Download PDFInfo
- Publication number
- DK149558B DK149558B DK217879AA DK217879A DK149558B DK 149558 B DK149558 B DK 149558B DK 217879A A DK217879A A DK 217879AA DK 217879 A DK217879 A DK 217879A DK 149558 B DK149558 B DK 149558B
- Authority
- DK
- Denmark
- Prior art keywords
- steam
- heat exchanger
- preheater
- bundles
- sub
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air Supply (AREA)
- Beans For Foods Or Fodder (AREA)
- Drying Of Solid Materials (AREA)
- Glass Compositions (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
i 149558and 149558
Den foreliggende opfindelse angår en fødevandsforvarmer med en varmeveksler med en afslutningsunderstøtningsflade og bestående af i det mindste en kold og i det mindste en varm rørbundtdel med en mellem disse anbragt central dampfor-5 delingskanal.The present invention relates to a feed water preheater with a heat exchanger with a termination support surface and consisting of at least one cold and at least one hot pipe bundle part with a central steam distribution channel arranged between them.
Når der i en fødevandsforvarmer, navnlig en kondensationsforvarmer, indføres overhedet damp, kan ved tilstrækkelig overhedning af dampen en del af overhedningsvarmen udnyttes termodynamisk i en varmeveksler. Dampen indføres i varmeveks-10 leren gennem en mod rørbundterne rettet stuts og føres i modstrøm rundt om rørbundterne og opvarmer derved det i rørene strømmende fødevand, hvorunder opvarmningen sker ved konvektion. Efter gennemstrømning gennem varmeveksleren når dampen ind i forvarmerens kondensationsdel, hvor den kondenseres.When superheated steam is introduced into a feedwater preheater, in particular a condensation preheater, a part of the superheating heat can be utilized thermodynamically in a heat exchanger with sufficient superheating of the steam. The steam is introduced into the heat exchanger through a nozzle directed towards the pipe bundles and is passed in countercurrent around the pipe bundles, thereby heating the feed water flowing in the pipes, during which the heating takes place by convection. After flowing through the heat exchanger, the steam reaches the condensing part of the preheater, where it is condensed.
15 I fødevandsforvarmere er damptrykket i forvarmerens kondensationsdel på grund af de strømningstab, som sker ved dampens gennemstrømning gennem varmeveksleren, væsentligt lavere end ved dampens indtræden i varmeveksleren.In feed water preheaters, the vapor pressure in the condensing part of the preheater due to the flow losses that occur during the flow of steam through the heat exchanger is significantly lower than when the steam enters the heat exchanger.
Ved kendte konstruktioner (tysk offentliggørelsesskrift 20 nr. 24 41 324) findes der mellem varmevekslerens afslutningsunder s tø tningsplade og forvarmerrørene ringspalter ved rørgennemføringerne, gennem hvilke dampen også uden for varmevekslerafgangen f.eks. fra en dampfordelingskanal kan nå ind i kondensationszonen.In known constructions (German Publication No. 20 no. 24 41 324) there are gap gaps at the pipe penetrations at the pipe penetrations between the heat exchanger end plate and the preheater pipes, through which the steam also outside the heat exchanger outlet e.g. from a vapor distribution channel can reach the condensation zone.
25 Ved lodretstående forvarmere med en nedefra og opef ter rettet dampstrømning befinder der sig på varmevekslerens afslutningsunderstøtningsflade et kondensatlag, og ved store forvarmere kan dampens hastighed i ringspalterne være meget høj, således at vanddråber af kondensatlaget rives med og 30 slynges mod rørvæggene. Derved kan der forekomme beskadigelser på grund af mekanisk slid samt erosions- og korrosionsskader, hvilket kan medføre ødelæggelse af rør.25 In the case of vertical preheaters with a steam flow from below and upwards, a condensate layer is present on the end support surface of the heat exchanger, and in the case of large preheaters the velocity of the steam in the annular gaps can be very high. This can lead to damage due to mechanical wear as well as erosion and corrosion damage, which can lead to damage to pipes.
Formålet med den foreliggende opfindelse er at tilvejebringe en fødevandsforvarmer, ved hvilken trykforskellen 35 før og efter varmevekslerens afslutningsskærmplade reduceres, og ved hvilken der fås en optimal udnyttelse af damptemperaturen, uden at der i varmeveksleren optræder beskadigelser af anlægget.The object of the present invention is to provide a feed water preheater, in which the pressure difference 35 before and after the end shield plate of the heat exchanger is reduced, and in which an optimal utilization of the steam temperature is obtained without damage to the plant occurring in the heat exchanger.
2 1495582 149558
Denne opgave løses ifølge opfindelsen ved, at den varm-me rørbundtdel er opdelt i mindst to delbundter, nemlig et varmevekslerbundt og et kondensationsbundt, og at der mellem de to delbundter er anbragt en kondensatafløbsrende.This object is solved according to the invention in that the hot pipe bundle part is divided into at least two sub-bundles, namely a heat exchanger bundle and a condensation bundle, and that a condensate drain gutter is arranged between the two sub-bundles.
5 Det er endvidere hensigtsmæssigt, dersom tvsrsnittene af de to delbundter, som bestryges af dampen, er tilnærmelsesvis lige store. .5 It is also expedient if the cross-sections of the two sub-bundles covered by the steam are approximately equal. .
Derved opnås den fordel, at man f.eks. ved dimensioneringen af fødevandsforvarmere kan opnå en standardisering 10 af rørbundterne.Thereby the advantage is obtained that e.g. when dimensioning feed water preheaters can achieve a standardization 10 of the pipe bundles.
Alt efter forvarmerens størrelse og kapacitet kan det være fordelagtigt, dersom de to delbundter har et i forhold til hinanden variabelt tværsnit.Depending on the size and capacity of the preheater, it can be advantageous if the two sub-bundles have a mutually variable cross-section.
Denne udformning vil være fordelagtig overalt, hvor 15 der optræder høje damphastigheder. Ved en sådan udformning føres en mindre dampmængde gennem varmevekslerdelbundtet og en større dampmængde gennem kondensationsdelbundtet.This design will be advantageous wherever high steam velocities occur. In such a design, a smaller amount of steam is passed through the heat exchanger sub-bundle and a larger amount of steam is passed through the condensation sub-bundle.
Ifølge en foretrukken udførelsesform kan der til de varme delbundters kondensatbortledning være anbragt opsam-20 lingslommer mellem kondensatafløbsrenderne og radiale skærmplader .According to a preferred embodiment, collecting pockets can be arranged between the condensate drain gutters and radial screen plates for the condensate drainage of the hot sub-bundles.
rordelen ved forvarmeren ifølge opfindelsen består navnlig i, at der ved opdelingen af den varme rørbundtdel i to delbundter, nemlig i et indre og et ydre delbundt, fås en 25 reduktion af trykforskellen før og efter varmevekslerens understøtningsflade og dermed også af ringspaltegennemstrømningshastigheden trods en forholdsvis stor overstrømningshastighed af dampen i varmeveksleren. Samtidig kan dampen forlade varmeveksleren ved et strømningsgunstigt sted og der indtræde 30 i den centrale dampfordelingskanal. Ved anbringelsen af i det mindste en,men fortrinsvis to overfor hinanden beliggende damptilgange, som fortrinsvis ved U-formede rørbundter er rettede vinkelret på U-grenenes plan, kan dampen indledes i forvarmeren på det sted, hvor der ikke forefindes rør, såle-35 des at den først udfylder dette rum og først derefter med ensartet og tilladelig hastighed omstrømmer rørene i varmeveksleren, således at det, samtidig med at beskadigelser er udelukket, opnås, at der heller ikke kan optræde vibrationer.the pipe part of the preheater according to the invention consists in particular in that by dividing the hot pipe bundle part into two sub-bundles, namely in an inner and an outer sub-bundle, a reduction of the pressure difference before and after the support surface of the heat exchanger and thus also of the ring gap flow rate overflow rate of the steam in the heat exchanger. At the same time, the steam can leave the heat exchanger at a flow-favorable location and 30 enter the central steam distribution channel. By arranging at least one, but preferably two opposite steam approaches, which are preferably directed at U-shaped pipe bundles perpendicular to the plane of the U-branches, the steam can be introduced into the preheater at the place where there are no pipes, thus 35 that it first fills this space and only then flows the pipes in the heat exchanger at a uniform and permissible speed, so that, at the same time as damage is excluded, it is achieved that no vibrations can occur either.
U9558 3U9558 3
Anbringelsen af kondensatafløbsrender muliggør afløb af kondensat, som samler sig på skærmpladerne oven over varmeveksleren, samt fra afslutningsunderstøtningsfladen, hvorved den varmeflade, som ved stillestående kondensat ville blive 5 inaktiv, atter er til rådighed for forvarmeprocessen, og endvidere forhindres sammenstød mellem damp og kondensat, således at dampstrømmen ikke medriver vanddråber.The placement of condensate drain gutters allows condensate to drain, which accumulates on the screen plates above the heat exchanger, as well as from the termination support surface, whereby the heating surface, which would become inactive with a standing condensate, is again available for the preheating process. so that the steam flow does not entrain water droplets.
På tegningen er en udførelsesform for fødevandsfor-varmeren ifølge opfindelsen vist i forenklet form. På tegningen 10 viser: fig. 1 et længdesnit gennem en fødevandsforvarmer i-følge opfindelsen, og fig. 2 et tværsnit efter linierne I-I i fig. 1.In the drawing, an embodiment of the feed water preheater according to the invention is shown in simplified form. In the drawing 10 shows: fig. 1 is a longitudinal section through a feed water preheater according to the invention, and fig. 2 is a cross-section along the lines I-I in FIG. 1.
15 I fig. 1 betegner 1 en yderkappe af en fødevandsforvarmer, ved hvis nederste ende der er anbragt i det mindste en damptilgang 2 på en sådan måde, at den står vinkelret på planet af U-grenene af U-formet udformede rørbundter 3, som 20 af hensyn til overskueligheden kun er antydet i fig. 1, hvorved dampen, efter at være strømmet gennem damptilgangen 2, først når ind i en rørfri zone 2' i fødevandsforvarmeren. Desuden er der ved den nederste ende af yderkappen 1 anbragt kondensatudløbsåbninger 4. I den nederste del af fødevands-25 forvarmeren er anbragt en varmeveksler 5, der ved hjælp af en afslutningsunderstøtningsflade 7 og en vægflade 7' er adskilt fra et kondensationsrum 6. I det indre af varmveksleren 5 er anbragt dampledeplader 8, som dampen omstrømmer i pilretningen. I afslutningsunderstøtningspladen 7 indmunder en 30 dampfordelingskanal 9 med dækplader 10 og dampudstrømningsåbninger 11 til kondensatidmsrummet 6. Endvidere har dækpladerne 10 dampindstrømningsåbninger 12, gennem hvilke damp strømmen ensartet føres ind mellem rørbundterne 13. Endvidere er der i kondensationsrummet 6 anbragt et udluftnings-35 rør 13 samt kondensatafløbsrender 14. I kondensationsrummet 6 er der mellem rørbundterne 3 anbragt skærmplader 15, og kondensatafløbsrenderne 14's gennemføringer gennem dækpladerne 10 er udformede som opsamlingslommer 16.In FIG. 1 denotes 1 an outer casing of a feed water preheater, at the lower end of which at least one steam inlet 2 is arranged in such a way that it is perpendicular to the plane of the U-branches of U-shaped tubular bundles 3, which 20 for the sake of the clarity is only indicated in fig. 1, whereby the steam, after flowing through the steam inlet 2, first reaches a tubeless zone 2 'in the feed water preheater. In addition, condensate outlet openings 4 are arranged at the lower end of the outer casing 1. A heat exchanger 5 is arranged in the lower part of the feed water preheater, which is separated from a condensing space 6 by means of a termination support surface 7 and a wall surface 7 '. inside the heat exchanger 5 are arranged steam baffle plates 8, which the steam flows around in the direction of the arrow. In the termination support plate 7 a steam distribution channel 9 with cover plates 10 and steam outflow openings 11 to the condensate space 6 flows into. condensate drain gutters 14. In the condensation space 6, screen plates 15 are arranged between the pipe bundles 3, and the penetrations of the condensate drain gutters 14 through the cover plates 10 are designed as collecting pockets 16.
4 149558 I fig. 2 er dele svarende til dele i fig. 1 betegnede med samme henvisningstal som i fig. 1. Også her omgiver yderkappen 1 rørbundterne 3/ der er opdelt i en kold rørbundtdel 17 og en i to delbundter 18a og 18b opdelt varm rørbundtdel.4 149558 In fig. 2 are parts corresponding to parts in fig. 1 denoted by the same reference numerals as in FIG. Here too, the outer casing 1 surrounds the pipe bundles 3 / which are divided into a cold pipe bundle part 17 and a hot pipe bundle part divided into two sub bundles 18a and 18b.
5 Af de to delbundter 18a og 18b udgør det inderste delbundt 18a varmeveksleren, og det yderste delbundt 18b kondensatoren. Mellem de to delbundter 18a og 18b forløber kondensatafløbsrenderne 14 i fødevandsforvarmerens længderetning. Både ved den kolde rørbundtdel 17 og mellem de to varme rørbundtdele 10 18a og 18b er der anbragt udluftningsrør 13.Of the two sub-bundles 18a and 18b, the inner sub-bundle 18a constitutes the heat exchanger and the outer sub-bundle 18b the capacitor. Between the two sub-bundles 18a and 18b, the condensate drain gutters 14 extend in the longitudinal direction of the feed water preheater. Both at the cold pipe bundle part 17 and between the two hot pipe bundle parts 18a and 18b, vent pipes 13 are arranged.
Tværsnittene af de to varme rørbundtdele 18,18b kan, afhængigtaf forvarmerens kapacitet, enten være lige store eller variable i forhold til hinanden, hvorhos den som varmeveksler tjenende rørbundtdel 18a kan have et tilnærmelsesvis 15 rektangulært tværsnit.The cross-sections of the two hot pipe bundle parts 18, 18b can, depending on the capacity of the preheater, be either equal or variable relative to each other, whereby the pipe bundle part 18a serving as a heat exchanger can have an approximately rectangular cross-section.
I fig. 1 og.2 er dampstrømmens retning antydet med krumme pile, og kondensatafløbsretningen er i fig. 1 vist med lige pile.In FIG. 1 and 2, the direction of the steam flow is indicated by curved arrows, and the condensate drain direction is in fig. 1 shown with straight arrows.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH594178A CH628410A5 (en) | 1978-05-31 | 1978-05-31 | Feed water preheater. |
CH594178 | 1978-05-31 |
Publications (3)
Publication Number | Publication Date |
---|---|
DK217879A DK217879A (en) | 1979-12-01 |
DK149558B true DK149558B (en) | 1986-07-21 |
DK149558C DK149558C (en) | 1987-03-30 |
Family
ID=4301860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK217879A DK149558C (en) | 1978-05-31 | 1979-05-25 | FATWATER PREHEATER |
Country Status (23)
Country | Link |
---|---|
US (1) | US4249485A (en) |
JP (1) | JPS54156901A (en) |
AR (1) | AR216394A1 (en) |
AT (1) | AT395756B (en) |
AU (1) | AU529251B2 (en) |
BR (1) | BR7903279A (en) |
CA (1) | CA1123288A (en) |
CH (1) | CH628410A5 (en) |
CS (1) | CS212318B2 (en) |
DE (2) | DE2827309C2 (en) |
DK (1) | DK149558C (en) |
ES (1) | ES480934A0 (en) |
FI (1) | FI64993C (en) |
FR (1) | FR2427550A1 (en) |
HU (1) | HU179434B (en) |
IT (1) | IT1120914B (en) |
NL (1) | NL184808C (en) |
NO (1) | NO149185C (en) |
PL (1) | PL122236B1 (en) |
PT (1) | PT69668A (en) |
SE (1) | SE429259B (en) |
YU (1) | YU39011B (en) |
ZA (1) | ZA791384B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914682B2 (en) * | 1980-09-29 | 1984-04-05 | 株式会社日立製作所 | feed water heater |
DE3360205D1 (en) * | 1982-06-30 | 1985-06-27 | Bbc Brown Boveri & Cie | High-pressure feed water heater disposed upright in a header construction with a desuperheater casing |
EP0097989B1 (en) * | 1982-06-30 | 1985-05-22 | BBC Aktiengesellschaft Brown, Boveri & Cie. | High pressure feedwater heater disposed upright in a header construction with a desuperheater and a steam-water separator |
DE3461332D1 (en) * | 1983-04-29 | 1987-01-02 | Bbc Brown Boveri & Cie | Feed-water heater |
EP0131670B2 (en) * | 1983-07-13 | 1991-01-02 | Hamon-Sobelco S.A. | Feed-water preheater with a desuperheater, in particular for a thermal power plant |
JPH0245225U (en) * | 1988-09-24 | 1990-03-28 | ||
FR2838986A1 (en) | 2002-04-29 | 2003-10-31 | Cit Alcatel | Equipment for coating internal surface of inaccessible pipe or duct, e.g. for cable, comprises cylindrical body which has locating wings, orifices for propulsion jets, an anti return skirt and an angled spreading spatula |
JP4230841B2 (en) * | 2003-07-30 | 2009-02-25 | 株式会社東芝 | Condenser |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US958845A (en) * | 1909-08-04 | 1910-05-24 | Winfield S Parr | Water heater and purifier. |
US3020024A (en) * | 1959-01-07 | 1962-02-06 | Griscom Russell Co | Heat exchanger construction |
US2995341A (en) * | 1959-01-08 | 1961-08-08 | Griscom Russell Co | Feed water heater sub-cooling zone |
US3795273A (en) * | 1972-06-12 | 1974-03-05 | Foster Wheeler Corp | Feedwater heater |
US3938588A (en) * | 1973-10-18 | 1976-02-17 | Westinghouse Electric Corporation | Deaerating feedwater heater |
CH573573A5 (en) * | 1974-07-29 | 1976-03-15 | Bbc Brown Boveri & Cie |
-
1978
- 1978-05-31 CH CH594178A patent/CH628410A5/en not_active IP Right Cessation
- 1978-06-21 DE DE2827309A patent/DE2827309C2/en not_active Expired
- 1978-06-21 DE DE19787818660U patent/DE7818660U1/en not_active Expired
-
1979
- 1979-02-28 AT AT0151079A patent/AT395756B/en not_active IP Right Cessation
- 1979-03-09 YU YU00574/79A patent/YU39011B/en unknown
- 1979-03-16 CS CS791766A patent/CS212318B2/en unknown
- 1979-03-21 AU AU45302/79A patent/AU529251B2/en not_active Expired
- 1979-03-22 ZA ZA791384A patent/ZA791384B/en unknown
- 1979-04-18 JP JP4677679A patent/JPS54156901A/en active Granted
- 1979-05-09 US US06/037,510 patent/US4249485A/en not_active Expired - Lifetime
- 1979-05-16 CA CA327,784A patent/CA1123288A/en not_active Expired
- 1979-05-25 NO NO791732A patent/NO149185C/en unknown
- 1979-05-25 SE SE7904585A patent/SE429259B/en not_active IP Right Cessation
- 1979-05-25 PT PT69668A patent/PT69668A/en unknown
- 1979-05-25 DK DK217879A patent/DK149558C/en not_active IP Right Cessation
- 1979-05-25 BR BR7903279A patent/BR7903279A/en unknown
- 1979-05-25 ES ES480934A patent/ES480934A0/en active Granted
- 1979-05-25 FI FI791667A patent/FI64993C/en not_active IP Right Cessation
- 1979-05-28 FR FR7913449A patent/FR2427550A1/en active Granted
- 1979-05-29 AR AR276699A patent/AR216394A1/en active
- 1979-05-29 NL NLAANVRAGE7904199,A patent/NL184808C/en not_active IP Right Cessation
- 1979-05-29 IT IT23066/79A patent/IT1120914B/en active
- 1979-05-29 HU HU79BO1787A patent/HU179434B/en not_active IP Right Cessation
- 1979-05-29 PL PL1979215948A patent/PL122236B1/en unknown
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Legal Events
Date | Code | Title | Description |
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PBP | Patent lapsed |